Quasi-6-day waves in the mesosphere and lower thermosphere region and their possible coupling with the QBO and solar 27-day rotation

Wang, Jianyuan; Yi, Wen; Chen, Tingdi; Xue, Xianghui

doi:10.26464/epp2020024

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…The 10 days (8-12 days) and 16 days (12-20 days) waves in the high latitudes obtained from the DMR, SMR, and TMR, in higher middle latitudes obtained from the MMR are mainly enhanced during winter and are weak during summer. The statistics of planetary waves (2-16 days) using the meteor radars in this study are generally consistent with the results described by Murphy et al (2007) using Davis MF radar wind and hydroxyl rotational temperature measurements, and those of Gong et al (2018Gong et al ( , 2020 and Wang et al (2020) using the MMR and BMR meteor radar wind measurements. Generally, the amplitudes of planetary waves are strongest in the SMR temperatures; and the amplitudes of planetary waves in northern high latitudes are greater than that of in southern latitudes.…”

Section: Seasonal Variations Of Mesopause Temperature and Hemisphericsupporting

confidence: 88%

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Climatology of Interhemispheric Mesopause Temperatures Using the High‐Latitude and Middle‐Latitude Meteor Radars

Xue

Murphy

et al. 2021

JGR Atmospheres

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The polar mesopause in summer is the coldest region of the Earth because gravity wave-driven mean meridional circulation results in upwelling and adiabatic cooling in the summer polar mesopause region (see e.g., Fritts et al., 2003). Accurate observations of mesopause temperature are essential for studying the short-term dynamics and long-term climate of the middle and upper atmosphere. However, the specific environment of the mesosphere makes obtaining continuous measurements of mesopause temperature quite difficult. Ground-based radio radars, such as MF (medium frequency) and VHF (very high frequency) radars, are widely used to measure the neutral horizontal wind in the mesosphere, but they are not capable of measuring temperature. Ground-based optical instruments, such as lidars and airglow spectrometers, can provide high temporal resolution and accurate temperature measurements but are limited to clear sky and often to nighttime conditions. Sounding rockets can provide a good in situ soundings of neutral mesospheric temperatures, but the high cost and complicated logistics of launching rockets generally make them impractical for routine observations. Meteor radars have been widely employed for investigating the mesosphere and lower thermosphere (MLT) region for decades, especially for the neutral wind of the MLT region. Because of the advantages Abstract We present the climatology of mesopause temperatures using high-latitude and middlelatitude meteor radars. The daily mesopause temperatures are estimated using ambipolar diffusion coefficient data from the meteor radars at Davis Station (68.6°S, 77.9°E), in Antarctica, Svalbard (78.3°N, 16°E), Tromsø (69.6°N, 19.2°E) in the Arctic, and Mohe (53.5°N, 122.3°E) and Beijing (40.3°N, 116.2°E) in the northern middle latitudes. The seasonal variations in the meteor radar-derived temperatures are in good agreement with the temperatures from the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument onboard the TIMED satellite. Interhemispheric observations indicate that the mesopause temperatures over the southern and northern polar regions show a clear seasonal asymmetry. The seasonal variations in the Davis Station meteor radar temperatures in the southern polar mesopause are dominated by an annual oscillation (AO) with a relatively weak semiannual oscillation (SAO), which show a clear minimum during summer and a maximum during winter. The mesopause temperatures in the northern high and middle latitudes observed by the Svalbard, Tromsø, Mohe, and Beijing meteor radars mainly show an AO, with a maximum during winter and a minimum during summer. The AO in the northern polar regions is stronger than that in the southern polar regions, while the SAO in the southern polar regions is relatively strong compared to that in the northern polar regions. YI ET AL.

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Section: Seasonal Variations Of Mesopause Temperature and Hemisphericsupporting

confidence: 88%

“…(2018, 2020) and Wang et al. (2020) using the MMR and BMR meteor radar wind measurements. Generally, the amplitudes of planetary waves are strongest in the SMR temperatures; and the amplitudes of planetary waves in northern high latitudes are greater than that of in southern latitudes.…”

Section: Seasonal Variations Of Mesopause Temperature and Hemisphericmentioning

confidence: 99%

Climatology of Interhemispheric Mesopause Temperatures Using the High‐Latitude and Middle‐Latitude Meteor Radars

Xue

Murphy

et al. 2021

JGR Atmospheres

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“…In the past decades, there have been many reports of planetary waves in the MLT region. Planetary waves are usually observed for periods of around 2, 4–7, 8–12, and 12–20 days (e.g., Manson and Meek, 1986; Mitchell et al, 1999; Miyoshi, 1999; Riggin et al, 2006; Pancheva et al, 2008; Gan Q et al, 2015; John and Kumar, 2016; Huang CM et al, 2017; Huang YY et al, 2017; Ma Z et al, 2017; Gong Y et al, 2018, 2019; Wang JY et al, 2020). Researchers (e.g., Charney and Drazin, 1961; Salby, 1981a, b; Forbes et al, 1995) have suggested that planetary waves in the MLT region are generated in situ or that they are excited in the troposphere and stratosphere and then propagate into the MLT.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the quasi-16-day wave in the mesosphere and lower thermosphere region as revealed by meteor radar, Aura satellite, and MERRA2 reanalysis data from 2008 to 2017

Gong

et al. 2020

Earth and Planetary Physics

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Key Points:Quasi-16-day waves (Q16DW) were revealed by using multiple extensive data sets q Latitude and seasonal variations were revealed by using wind and temperature measurements, and a comparison was performed q The possibility of upward propagation of the Q16DW from the troposphere to the mesosphere and lower thermosphere at the three stations was examined q Citation: Gong, . (2020). Characteristics of the quasi-16-day wave in the mesosphere and lower thermosphere region as revealed by meteor radar, Aura satellite, and MERRA2 reanalysis data from 2008 to 2017. Earth Planet. Phys., 4(3), 274-284. http://doi. Abstract:This study presents an analysis of the quasi-16-day wave (Q16DW) at three stations in the middle latitudes by using a meteor radar chain in conjunction with Aura Microwave Limb Sounder temperature data and MERRA2 (Modern-Era Retrospective Analysis for Research and Applications, Version 2) reanalysis data from 2008 to 2017. The radar chain consists of three meteor radar stations located at Mohe (MH, 53.5°N, 122.3°E), Beijing (BJ, 40.3°N, 116.2°E), and Wuhan (WH, 30.5°N, 114.6°E). The Q16DW wave exhibits similar seasonal variation in the neutral wind and temperature, and the Q16DW amplitude is generally strong during winter and weak around summer. The Q16DW at BJ was found to have secondary enhancement around September in the zonal wind, which is rarely reported at similar latitudes. The latitudinal variations of the Q16DW in the neutral wind and temperature are quite different. The Q16DW at BJ is the most prominent in both neutral wind components among the three stations and the Q16DW amplitudes at MH and WH are comparable, whereas the wave amplitude in temperature decreases with decreasing latitude. The quasi-geostrophic refractive index squared at the three stations in the period from 2008 to 2017 was revealed. The results indicate that the Q16DW in the mesosphere and lower thermosphere (MLT) at MH has a limited contribution from the lower atmosphere. Around March and October, the Q16DW in the troposphere at BJ can propagate upward into the MLT region, whereas at WH, the contribution to the Q16DW in the MLT region is largely from the mesosphere.Planetary waves are usually observed for periods of around 2, 4-7, 8-12, and 12-20 days (e.

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Observation of MLT region winds and tides by the USTC Mengcheng meteor radar

Yi¹,

Xue²,

Zeng³

et al. 2023

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The atmospheric winds and waves in the mesosphere and lower thermosphere (MLT) region are essential for studying the dynamics and climate in the middle and upper atmosphere. The University of Science and Technology of China (USTC) meteor radar located at Mengcheng (33.36°N, 116.49°E) has been operating continuously since April 2014. More than 8 years of observation of mesospheric horizontal winds and tides are presented in this study. In addition, we present an intercomparison among the meteor radar observations and the Navy Global Environmental Model-High Altitude (NAVGEM-HA) analysis results. The meteor number at northern lower midlatitudes suffers from diurnal variations in meteor occurrence, with a high count rate in the local morning and a low rate during local afternoon-to-midnight. The meteor count rates show a clear annual variation, with a maximum in September–October and a minimum in February. The horizontal wind in the MLT region has dominant annual variations at lower midlatitudes, with the eastward wind during summer and the westward wind during winter above 84 km, and the eastward wind during winter and the westward wind during spring below 84 km. The meridional wind is northward during winter and southward during summer. The diurnal amplitude is dominant, followed by the semidiurnal tides at lower midlatitudes. The zonal and meridional diurnal tides show enhancements during spring (March) with amplitudes that can reach up to 40 m/s and 30 m/s and during autumn (September) with amplitudes that can reach up to 30 m/s and 25 m/s, respectively. The seasonal variations in diurnal tidal amplitude basically show characteristics that are strong during the equinox and weak during the solstice. The zonal and meridional semidiurnal tides are maximized during spring (April) and autumn (September) above 90 km.

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Quasi-6-day waves in the mesosphere and lower thermosphere region and their possible coupling with the QBO and solar 27-day rotation

Cited by 3 publications

References 30 publications

Climatology of Interhemispheric Mesopause Temperatures Using the High‐Latitude and Middle‐Latitude Meteor Radars

Climatology of Interhemispheric Mesopause Temperatures Using the High‐Latitude and Middle‐Latitude Meteor Radars

Characteristics of the quasi-16-day wave in the mesosphere and lower thermosphere region as revealed by meteor radar, Aura satellite, and MERRA2 reanalysis data from 2008 to 2017

Observation of MLT region winds and tides by the USTC Mengcheng meteor radar

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